Why this Technical Blog for WFRM ?

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We have created this Technical Blog to help the technical culture and training of WFRM and to collect publications , technical documents for the work of creating and maintenance of our Broadcasting networks around the whole world .

Eng.Claudio Re 

WRFM & RM Network Supervisor 



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WHY USE THE ONE PORT RETURN LOSS MEASUREMENT INSTEAD OF THE TWO PORT TRANSMISSION LOSS MEASUREMENT

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How to tune a Coaxial Filter     In Fig.1 is shown the connection between Spectrum Analyzer-Rhotector (VSWR Bridge ) and a Coaxial Filter:                                                             Fig. 1. Connections between the instruments.   With this kind of connection you can measure the Return Loss or the Standing Wave Ratio of the coaxial filter at port F (shown in Fig. 1), Table 1 reports the relationship between the R.L and the VSWR. Table 1. Return Loss and SWR.     The Coaxial Filter is tuned by rotating the four knobs named Lin, Lacc1, Lacc2 and Lout, as in Fig 2. Delta Meccanica provides a graduation and a table for  the first position where is better to start the tuning. Fig. 2. Tuning Kobs. Delta Meccanica provides a graduation and a table for  the first position where is better to start the tuning. Table 1 shows the settings on two commonly used models of Delta Meccanica Coaxial Filters.                                                            
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HOW TO USE AN RTL KEY , HDSDR , VB HIFI CABLE AND SDR SPY FOR A FULL RDS FM DECODER

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Having already installed the software HDSDR for the RTL Key , you can add VB Cable and SDR SPY to build a full RDS FM Decoder . This are the link where you can download all what is needed :  1) HDSDR :  https://www.hdsdr.de/ 2) VB Audio HIFI Cable :  http://vincent.burel.free.fr/VirtualAudioApps/HiFiCableAsioBridgeSetup_v1007.zip 3) RDS SPY :  http://www.rdsspy.com/   Download :  http://rdsspy.com/download/mainapp/RDS_Spy_1.03_Setup.exe Following some picture of the settings ( I think I will make a video about )  And in the two following images the main results that you can get :  Thanks a lot to Giampiero Bernardini and Emanuele Pelicioli for the support in the settings . Claudio Re 
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